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9p/cache.c: Fix memory leak in v9fs_cache_session_get_cookie
v9fs_cache_session_get_cookie assigns a random cachetag to v9ses->cachetag, if the cachetag is not assigned previously. v9fs_random_cachetag allocates memory to v9ses->cachetag with kmalloc and uses scnprintf to fill it up with a cachetag. But if scnprintf fails, v9ses->cachetag is not freed in the current code causing a memory leak. Fix this by freeing v9ses->cachetag it v9fs_random_cachetag fails. This was reported by syzbot, the link to the report is below: https://syzkaller.appspot.com/bug?id=f012bdf297a7a4c860c38a88b44fbee43fd9bbf3 Link: http://lkml.kernel.org/r/20190522194519.GA5313@bharath12345-Inspiron-5559 Reported-by: syzbot+3a030a73b6c1e9833815@syzkaller.appspotmail.com Signed-off-by: Bharath Vedartham <linux.bhar@gmail.com> Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr>
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@ -51,6 +51,8 @@ void v9fs_cache_session_get_cookie(struct v9fs_session_info *v9ses)
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if (!v9ses->cachetag) {
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if (v9fs_random_cachetag(v9ses) < 0) {
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v9ses->fscache = NULL;
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kfree(v9ses->cachetag);
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v9ses->cachetag = NULL;
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return;
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}
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}
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