[cbr79] ALSA: usb-audio: Fix out of bounds reads when finding clock sources #302
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jira VULN-46526 cve CVE-2024-53150 commit-author Takashi Iwai <[email protected]> commit a3dd4d6 upstream-diff used linux-stable LT-5.4 sha a632bdc The current USB-audio driver code doesn't check bLength of each descriptor at traversing for clock descriptors. That is, when a device provides a bogus descriptor with a shorter bLength, the driver might hit out-of-bounds reads. For addressing it, this patch adds sanity checks to the validator functions for the clock descriptor traversal. When the descriptor length is shorter than expected, it's skipped in the loop. For the clock source and clock multiplier descriptors, we can just check bLength against the sizeof() of each descriptor type. OTOH, the clock selector descriptor of UAC2 and UAC3 has an array of bNrInPins elements and two more fields at its tail, hence those have to be checked in addition to the sizeof() check. Reported-by: Benoît Sevens <[email protected]> Cc: <[email protected]> Link: https://lore.kernel.org/[email protected] Link: https://patch.msgid.link/[email protected] Signed-off-by: Takashi Iwai <[email protected]> (cherry picked from commit a3dd4d6) Signed-off-by: Brett Mastbergen <[email protected]>
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requested review from
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thefossguy-ciq
jainanmol84
approved these changes
Jun 2, 2025
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jira VULN-46526
cve CVE-2024-53150
This is slightly different than the other CVE-2024-53150 PRs. Due to the age of this kernel I had to use the 5.4 stable backport version (which applied cleanly).
Build Log
Testing
The very limited number of kselftests were run before and after applying the fix
selftest-3.10.0-1160.119.1.el7_9.ciqcbr.4.1.x86_64.log
selftest-3.10.0-bmastbergen_ciqcbr7_9_VULN-46526-0de07c3+.log