greybus: audio: bound the topology section sizes against the fetched size

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gb_audio_gb_get_topology() fetches a topology blob of a module-supplied
size, and gbaudio_tplg_parse_data() then walks it by adding the
module-supplied size_dais, size_controls and size_widgets fields to
form the control, widget and route section offsets. Those le32 sizes
are never checked against the fetched blob, so a module reporting a
small topology size but large section sizes makes the offsets point
past the allocation, and parsing reads out of bounds.

Reject a topology whose section sizes do not fit within the fetched
size before it is parsed.

Fixes: 184992e305 ("greybus: audio: Add Greybus Audio Device Class Protocol helper routines")
Signed-off-by: Bryam Vargas <hexlabsecurity@proton.me>
Link: https://patch.msgid.link/20260616-b4-disp-4352e8b0-v1-1-3e09f62e0ad5@proton.me
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Bryam Vargas 2026-06-16 01:06:12 -05:00 • committed by Greg Kroah-Hartman

parent cbc8262f68

commit 33d8c7b794

1 changed files with 13 additions and 0 deletions

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drivers/staging/greybus/audio_gb.c

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