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cifs: fix potential use-after-free in cifs_oplock_break_put

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cfile may very well be freed after the cifsFileInfo_put. Make sure we
have a valid pointer to the superblock for cifs_sb_deactive.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Jeff Layton 2010-11-10 10:19:10 -05:00 committed by Steve French
parent f6614b7bb4
commit ebe2e91e00
1 changed files with 3 additions and 1 deletions
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4
fs/cifs/file.c
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@ -2271,8 +2271,10 @@ void cifs_oplock_break_get(struct cifsFileInfo *cfile)
void cifs_oplock_break_put(struct cifsFileInfo *cfile)
{
struct super_block *sb = cfile->dentry->d_sb;
cifsFileInfo_put(cfile);
cifs_sb_deactive(cfile->dentry->d_sb);
cifs_sb_deactive(sb);
}
const struct address_space_operations cifs_addr_ops = {