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[PATCH] smbfs: double free memory corruption 

smbfs allocates rq_trans2buffer to handle server's multi transaction2 response
messages.  As struct smb_request may be reused, rq_trans2buffer is freed
before each new request.  However if last servers's response is not multi but
single trans2 message then new rq_trans2buffer is not allocated but last
smb_rput still tries to free it again.

To prevent this issue rq_trans2buffer pointer should be set to NULL after
kfree.

Signed-off-by: Vasily Averin <vvs@sw.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Vasily Averin 2007-03-16 13:38:24 -08:00 committed by Linus Torvalds
parent 833f80627d
commit 1174cf7301
1 changed files with 1 additions and 0 deletions
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1
fs/smbfs/request.c
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@ -181,6 +181,7 @@ static int smb_setup_request(struct smb_request *req)
req->rq_errno = 0;
req->rq_fragment = 0;
kfree(req->rq_trans2buffer);
req->rq_trans2buffer = NULL;
return 0;
}