Closed Bug 866959 Opened 11 years ago Closed 11 years ago
Valgrind detects a Conditional jump or move depends on uninitialised value(s) error with mozilla::image::Raster
Image on the stack
Valgrind detects a Conditional jump or move depends on uninitialised value(s) error with mozilla::image::RasterImage on the stack, see attached snippet which comes from: https://tbpl.mozilla.org/php/getParsedLog.php?id=22356838&tree=Mozilla-Central&full=1 Guessing Core: ImageLib, please change component if necessary. Regression window: http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=3ada6a2fd0c6&tochange=64d6d002e888 s-s because conditional jumps can be bad, locking pending developer confirmation.
Valgrind points to: ==12769== Uninitialised value was created by a heap allocation ==12769== at 0x4C28A49: malloc (vg_replace_malloc.c:270) ==12769== by 0x760D005: moz_xmalloc (mozalloc.cpp:54) ==12769== by 0x8209756: imgStatusTracker::CloneForRecording() (mozalloc.h:201) ==12769== by 0x81F17E6: mozilla::image::RasterImage::InitDecoder(bool, bool) (RasterImage.h:401) ==12769== by 0x81F1EDB: mozilla::image::RasterImage::Init(char const*, unsigned int) (RasterImage.cpp:517) ==12769== by 0x81E7D47: mozilla::image::ImageFactory::CreateRasterImage(nsIRequest*, imgStatusTracker*, nsCString const&, nsIURI*, unsigned int, unsigned int) (ImageFactory.cpp:189) ==12769== by 0x81E7FF3: mozilla::image::ImageFactory::CreateImage(nsIRequest*, imgStatusTracker*, nsCString const&, nsIURI*, bool, unsigned int) (ImageFactory.cpp:106) /snip cc'ing some folks who might know what's going on.
I don't think this is s-s. The uninitialized value is used to determine whether or not to do invalidations, so while there's likely a rendering correctness problem here, there should be no security issues.
Suppression landed in: https://hg.mozilla.org/mozilla-central/rev/1eb382609c2d
Bug 854287 added mHasBeenDecoded but only initialized it in the imgStatusTracker(Image* aImage) constructor but not the imgStatusTracker(const imgStatusTracker& aOther) constructor.
Assignee: nobody → tnikkel
Attachment #743453 - Flags: review?(seth)
Comment on attachment 743453 [details] [diff] [review] patch Review of attachment 743453 [details] [diff] [review]: ----------------------------------------------------------------- Looks good. Thanks Timothy!
Attachment #743453 - Flags: review?(seth) → review+
https://hg.mozilla.org/mozilla-central/rev/e0f1b2ba992d Can we get a test for this?
Status: NEW → RESOLVED
Closed: 11 years ago
Resolution: --- → FIXED
Target Milestone: --- → mozilla23
Suppression removed in: https://hg.mozilla.org/mozilla-central/rev/d44cfdc9ec2e
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