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| author | Dominique Martinet <dominique.martinet@cea.fr> | 2018-08-28 01:32:35 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-11-22 09:32:46 +0300 |
| commit | 78a2d6e9a025931a1fdc0663fc693ebf5fe77026 (patch) | |
| tree | 6c96e9e1d8e3c61696c79e63cce3930f592f23ea /net/9p | |
| parent | b29137a4c89bc8ca3c9ea2e2ded7077858b0715c (diff) | |
| download | linux-78a2d6e9a025931a1fdc0663fc693ebf5fe77026.tar.xz | |
9p: clear dangling pointers in p9stat_free
[ Upstream commit 62e3941776fea8678bb8120607039410b1b61a65 ]
p9stat_free is more of a cleanup function than a 'free' function as it
only frees the content of the struct; there are chances of use-after-free
if it is improperly used (e.g. p9stat_free called twice as it used to be
possible to)
Clearing dangling pointers makes the function idempotent and safer to use.
Link: http://lkml.kernel.org/r/1535410108-20650-2-git-send-email-asmadeus@codewreck.org
Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr>
Reported-by: syzbot+d4252148d198410b864f@syzkaller.appspotmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/9p')
| -rw-r--r-- | net/9p/protocol.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/net/9p/protocol.c b/net/9p/protocol.c index ab9127ec5b7a..bceb6999614f 100644 --- a/net/9p/protocol.c +++ b/net/9p/protocol.c @@ -45,10 +45,15 @@ p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...); void p9stat_free(struct p9_wstat *stbuf) { kfree(stbuf->name); + stbuf->name = NULL; kfree(stbuf->uid); + stbuf->uid = NULL; kfree(stbuf->gid); + stbuf->gid = NULL; kfree(stbuf->muid); + stbuf->muid = NULL; kfree(stbuf->extension); + stbuf->extension = NULL; } EXPORT_SYMBOL(p9stat_free); |