cifs: fix NULL dereference in match_prepath
[ Upstream commit fe12926863
]
RHBZ: 1760879
Fix an oops in match_prepath() by making sure that the prepath string is not
NULL before we pass it into strcmp().
This is similar to other checks we make for example in cifs_root_iget()
Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -3652,8 +3652,10 @@ match_prepath(struct super_block *sb, struct cifs_mnt_data *mnt_data)
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{
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struct cifs_sb_info *old = CIFS_SB(sb);
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struct cifs_sb_info *new = mnt_data->cifs_sb;
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bool old_set = old->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH;
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bool new_set = new->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH;
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bool old_set = (old->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) &&
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old->prepath;
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bool new_set = (new->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) &&
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new->prepath;
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if (old_set && new_set && !strcmp(new->prepath, old->prepath))
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return 1;
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