smb: client: fix missing iov bounds check in parse_posix_sids()

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In parse_posix_sids(), sidsbuf_end is calculated using the server-supplied
out_len without being validated against the actual length of the received
iov (iov_len).

If a server provides an inflated out_len, sidsbuf_end will point past the
end of the iov. This defeats the bounds guards in posix_info_sid_size(),
allowing out-of-bounds reads into adjacent kernel memory.

Fix this by rejecting responses where the calculated sidsbuf_end would
exceed the received iov boundaries or cause pointer wraparound.

Fixes: a90f37e3d7 ("smb: client: parse owner/group when creating reparse points")
Cc: stable@vger.kernel.org
Signed-off-by: Frank Sorenson <sorenson@redhat.com>
Reviewed-by: David Howells <dhowells@redhat.com>
Signed-off-by: Paulo Alcantara <pc@manguebit.org>

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Frank Sorenson 2026-09-16 16:33:58 -05:00 • committed by Paulo Alcantara

parent eeb5ef6083

commit b09d092eb2

1 changed files with 11 additions and 0 deletions

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fs/smb/client/smb2inode.c

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