From: Ye Bin yebin10@huawei.com
mainline inclusion from mainline-5.14-rc5 commit b66541422824cf6cf20e9a35112e9cb5d82cdf62 category: bugfix bugzilla: 176138 https://gitee.com/openeuler/kernel/issues/I4DDEL
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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if (!ext4_has_feature_mmp(sb)) then retval can be unitialized before we jump to the wait_to_exit label.
Fixes: 61bb4a1c417e ("ext4: fix possible UAF when remounting r/o a mmp-protected file system") Signed-off-by: Ye Bin yebin10@huawei.com Link: https://lore.kernel.org/r/20210713022728.2533770-1-yebin10@huawei.com Signed-off-by: Theodore Ts'o tytso@mit.edu Signed-off-by: Baokun Li libaokun1@huawei.com Reviewed-by: Zhang Yi yi.zhang@huawei.com
Signed-off-by: Chen Jun chenjun102@huawei.com --- fs/ext4/mmp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/ext4/mmp.c b/fs/ext4/mmp.c index bc364c119af6..cebea4270817 100644 --- a/fs/ext4/mmp.c +++ b/fs/ext4/mmp.c @@ -138,7 +138,7 @@ static int kmmpd(void *data) unsigned mmp_check_interval; unsigned long last_update_time; unsigned long diff; - int retval; + int retval = 0;
mmp_block = le64_to_cpu(es->s_mmp_block); mmp = (struct mmp_struct *)(bh->b_data);