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smb3: missing lock when picking channel

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[ Upstream commit 8094a600245e9b28eb36a13036f202ad67c1f887 ]

Coverity spotted a place where we should have been holding the
channel lock when accessing the ses channel index.

Addresses-Coverity: 1582039 ("Data race condition (MISSING_LOCK)")
Cc: stable@vger.kernel.org
Reviewed-by: Shyam Prasad N <sprasad@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Steve French
2024-04-25 11:30:16 -05:00
committed by Greg Kroah-Hartman
parent ff03a8b422
commit 98c7ed29cd
1 changed files with 3 additions and 1 deletions
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4
fs/smb/client/transport.c
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@@ -1079,9 +1079,11 @@ struct TCP_Server_Info *cifs_pick_channel(struct cifs_ses *ses)
index = (uint)atomic_inc_return(&ses->chan_seq); index = (uint)atomic_inc_return(&ses->chan_seq);
index %= ses->chan_count; index %= ses->chan_count;
} }
server = ses->chans[index].server;
spin_unlock(&ses->chan_lock); spin_unlock(&ses->chan_lock);
return ses->chans[index].server; return server;
} }
int int