Fix crash in uvc_video_clock_update from Laurent Pinchart (rhbz 806433)
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99bedf074a
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295a916d88
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@ -42,7 +42,7 @@ Summary: The Linux kernel
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# When changing real_sublevel below, reset this by hand to 1
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# (or to 0 and then use rpmdev-bumpspec).
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#
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%global baserelease 2
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%global baserelease 3
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%global fedora_build %{baserelease}
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# real_sublevel is the 3.x kernel version we're starting with
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@ -691,6 +691,9 @@ Patch21305: mac80211-fix-possible-tid_rx-reorder_timer-use-after-free.patch
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#rhbz 804957 CVE-2012-1568
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Patch21306: shlib_base_randomize.patch
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#rhbz 806433
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Patch21360: uvcvideo-Fix-race-induced-crash-in-uvc_video_clock_update.patch
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#rhbz 770476
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Patch21370: iwlegacy-do-not-nulify-il-vif-on-reset.patch
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Patch21371: iwlwifi-do-not-nulify-ctx-vif-on-reset.patch
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@ -1294,6 +1297,9 @@ ApplyPatch KVM-Ensure-all-vcpus-are-consistent-with-in-kernel-i.patch
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ApplyPatch iwlegacy-do-not-nulify-il-vif-on-reset.patch
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ApplyPatch iwlwifi-do-not-nulify-ctx-vif-on-reset.patch
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#rhbz 806433
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ApplyPatch uvcvideo-Fix-race-induced-crash-in-uvc_video_clock_update.patch
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# END OF PATCH APPLICATIONS
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%endif
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@ -1942,6 +1948,7 @@ fi
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%changelog
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* Tue Apr 03 2012 Josh Boyer <jwboyer@redhat.com>
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- Fix crash in uvc_video_clock_update from Laurent Pinchart (rhbz 806433)
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- iwl{wifi,legacy}: Fix warnings on remove interface from Stanislaw Gruszka
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(rhbz 770467)
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@ -0,0 +1,113 @@
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@@ -, +, @@
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drivers/media/video/uvc/uvc_video.c | 50 ++++++++++++++++++++++------------
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1 files changed, 32 insertions(+), 18 deletions(-)
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--- a/drivers/media/video/uvc/uvc_video.c
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+++ a/drivers/media/video/uvc/uvc_video.c
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@@ -468,22 +468,30 @@ uvc_video_clock_decode(struct uvc_streaming *stream, struct uvc_buffer *buf,
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spin_unlock_irqrestore(&stream->clock.lock, flags);
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}
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-static int uvc_video_clock_init(struct uvc_streaming *stream)
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+static void uvc_video_clock_reset(struct uvc_streaming *stream)
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{
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struct uvc_clock *clock = &stream->clock;
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- spin_lock_init(&clock->lock);
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clock->head = 0;
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clock->count = 0;
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- clock->size = 32;
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clock->last_sof = -1;
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clock->sof_offset = -1;
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+}
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+
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+static int uvc_video_clock_init(struct uvc_streaming *stream)
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+{
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+ struct uvc_clock *clock = &stream->clock;
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+
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+ spin_lock_init(&clock->lock);
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+ clock->size = 32;
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clock->samples = kmalloc(clock->size * sizeof(*clock->samples),
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GFP_KERNEL);
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if (clock->samples == NULL)
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return -ENOMEM;
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+ uvc_video_clock_reset(stream);
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+
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return 0;
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}
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@@ -1424,8 +1432,6 @@ static void uvc_uninit_video(struct uvc_streaming *stream, int free_buffers)
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if (free_buffers)
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uvc_free_urb_buffers(stream);
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-
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- uvc_video_clock_cleanup(stream);
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}
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/*
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@@ -1555,10 +1561,6 @@ static int uvc_init_video(struct uvc_streaming *stream, gfp_t gfp_flags)
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uvc_video_stats_start(stream);
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- ret = uvc_video_clock_init(stream);
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- if (ret < 0)
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- return ret;
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-
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if (intf->num_altsetting > 1) {
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struct usb_host_endpoint *best_ep = NULL;
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unsigned int best_psize = 3 * 1024;
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@@ -1683,6 +1685,8 @@ int uvc_video_resume(struct uvc_streaming *stream, int reset)
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stream->frozen = 0;
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+ uvc_video_clock_reset(stream);
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+
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ret = uvc_commit_video(stream, &stream->ctrl);
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if (ret < 0) {
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uvc_queue_enable(&stream->queue, 0);
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@@ -1819,25 +1823,35 @@ int uvc_video_enable(struct uvc_streaming *stream, int enable)
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uvc_uninit_video(stream, 1);
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usb_set_interface(stream->dev->udev, stream->intfnum, 0);
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uvc_queue_enable(&stream->queue, 0);
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+ uvc_video_clock_cleanup(stream);
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return 0;
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}
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- ret = uvc_queue_enable(&stream->queue, 1);
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+ ret = uvc_video_clock_init(stream);
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if (ret < 0)
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return ret;
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+ ret = uvc_queue_enable(&stream->queue, 1);
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+ if (ret < 0)
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+ goto error_queue;
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+
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/* Commit the streaming parameters. */
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ret = uvc_commit_video(stream, &stream->ctrl);
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- if (ret < 0) {
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- uvc_queue_enable(&stream->queue, 0);
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- return ret;
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- }
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+ if (ret < 0)
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+ goto error_commit;
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ret = uvc_init_video(stream, GFP_KERNEL);
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- if (ret < 0) {
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- usb_set_interface(stream->dev->udev, stream->intfnum, 0);
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- uvc_queue_enable(&stream->queue, 0);
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- }
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+ if (ret < 0)
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+ goto error_video;
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+
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+ return 0;
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+
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+error_video:
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+ usb_set_interface(stream->dev->udev, stream->intfnum, 0);
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+error_commit:
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+ uvc_queue_enable(&stream->queue, 0);
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+error_queue:
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+ uvc_video_clock_cleanup(stream);
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return ret;
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}
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