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ext4_get_link(): fix breakage in RCU mode

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1) errors from ext4_getblk() should not be propagated to caller
unless we are really sure that we would've gotten the same error
in non-RCU pathwalk.
2) we leak buffer_heads if ext4_getblk() is successful, but bh is
not uptodate.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2024-02-03 01:17:34 -05:00
parent 0511fdb4a3
commit 9fa8e282c2
1 changed files with 5 additions and 3 deletions
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8
fs/ext4/symlink.c
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@ -92,10 +92,12 @@ static const char *ext4_get_link(struct dentry *dentry, struct inode *inode,
if (!dentry) {
bh = ext4_getblk(NULL, inode, 0, EXT4_GET_BLOCKS_CACHED_NOWAIT);
if (IS_ERR(bh))
return ERR_CAST(bh);
if (!bh || !ext4_buffer_uptodate(bh))
if (IS_ERR(bh) || !bh)
return ERR_PTR(-ECHILD);
if (!ext4_buffer_uptodate(bh)) {
brelse(bh);
return ERR_PTR(-ECHILD);
}
} else {
bh = ext4_bread(NULL, inode, 0, 0);
if (IS_ERR(bh))