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lib: Fix potential out of bounds access in ring stop code

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The subsequet code expects the read() to not have filled the entire
buffer, and yet we allow it to do so. Reduce the size passed to read()
by 1 to make the code sane.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
This commit is contained in:
Ville Syrjälä 2014-04-16 17:05:43 +03:00
parent 4aa2c102b9
commit 78e4c2b449
1 changed files with 1 additions and 1 deletions
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2
lib/igt_debugfs.c
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@ -666,7 +666,7 @@ enum stop_ring_flags igt_get_stop_rings(void)
fd = igt_debugfs_open("i915_ring_stop", O_RDONLY);
igt_assert(fd >= 0);
l = read(fd, buf, sizeof(buf));
l = read(fd, buf, sizeof(buf)-1);
igt_assert(l > 0);
igt_assert(l < sizeof(buf));