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cifs: fix use after free for iface while disabling secondary channels 

[ Upstream commit a15ccef82d3de9a37dc25898c60a394209368dc8 ]

We were deferencing iface after it has been released. Fix is to
release after all dereference instances have been encountered.

Signed-off-by: Ritvik Budhiraja <rbudhiraja@microsoft.com>
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <error27@gmail.com>
Closes: https://lore.kernel.org/r/202311110815.UJaeU3Tt-lkp@intel.com/
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Ritvik Budhiraja 2023-11-21 19:13:47 +05:30 committed by Greg Kroah-Hartman
parent bb536892da
commit a7b537b3be
1 changed files with 1 additions and 1 deletions
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2
fs/smb/client/sess.c
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@ -337,10 +337,10 @@ cifs_disable_secondary_channels(struct cifs_ses *ses)
if (iface) {
spin_lock(&ses->iface_lock);
kref_put(&iface->refcount, release_iface);
iface->num_channels--;
if (iface->weight_fulfilled)
iface->weight_fulfilled--;
kref_put(&iface->refcount, release_iface);
spin_unlock(&ses->iface_lock);
}