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ext4: initialize err_blk before calling __ext4_get_inode_loc

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commit c27c29c6af4f3f4ce925a2111c256733c5a5b430 upstream.

It is not guaranteed that __ext4_get_inode_loc will definitely set
err_blk pointer when it returns EIO. To avoid using uninitialized
variables, let's first set err_blk to 0.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com>
Link: https://lore.kernel.org/r/20211201163421.2631661-1-harshads@google.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Harshad Shirwadkar 2021-12-01 08:34:21 -08:00 committed by Greg Kroah-Hartman
parent f9ed0ea0a9
commit 720508dd11
1 changed files with 2 additions and 2 deletions
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4
fs/ext4/inode.c
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@ -4445,7 +4445,7 @@ has_buffer:
static int __ext4_get_inode_loc_noinmem(struct inode *inode,
struct ext4_iloc *iloc)
{
ext4_fsblk_t err_blk;
ext4_fsblk_t err_blk = 0;
int ret;
ret = __ext4_get_inode_loc(inode->i_sb, inode->i_ino, iloc, 0,
@ -4460,7 +4460,7 @@ static int __ext4_get_inode_loc_noinmem(struct inode *inode,
int ext4_get_inode_loc(struct inode *inode, struct ext4_iloc *iloc)
{
ext4_fsblk_t err_blk;
ext4_fsblk_t err_blk = 0;
int ret;
/* We have all inode data except xattrs in memory here. */