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authorTheodore Ts'o <tytso@mit.edu>2014-09-01 22:34:09 +0400
committerTheodore Ts'o <tytso@mit.edu>2014-09-01 22:34:09 +0400
commit705912ca95f4bbdbb3be753e46bf30d6be15a5e8 (patch)
tree39b983f9ac9964104cf1475e31631b6dd554c728 /fs/ext4/move_extent.c
parentbd30d702fc320085f178d22866b32fdc4736c991 (diff)
downloadlinux-705912ca95f4bbdbb3be753e46bf30d6be15a5e8.tar.xz
ext4: teach ext4_ext_find_extent() to free path on error
Right now, there are a places where it is all to easy to leak memory on an error path, via a usage like this: struct ext4_ext_path *path = NULL while (...) { ... path = ext4_ext_find_extent(inode, block, path, 0); if (IS_ERR(path)) { /* oops, if path was non-NULL before the call to ext4_ext_find_extent, we've leaked it! :-( */ ... return PTR_ERR(path); } ... } Unfortunately, there some code paths where we are doing the following instead: path = ext4_ext_find_extent(inode, block, orig_path, 0); and where it's important that we _not_ free orig_path in the case where ext4_ext_find_extent() returns an error. So change the function signature of ext4_ext_find_extent() so that it takes a struct ext4_ext_path ** for its third argument, and by default, on an error, it will free the struct ext4_ext_path, and then zero out the struct ext4_ext_path * pointer. In order to avoid causing problems, we add a flag EXT4_EX_NOFREE_ON_ERR which causes ext4_ext_find_extent() to use the original behavior of forcing the caller to deal with freeing the original path pointer on the error case. The goal is to get rid of EXT4_EX_NOFREE_ON_ERR entirely, but this allows for a gentle transition and makes the patches easier to verify. Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/move_extent.c')
-rw-r--r--fs/ext4/move_extent.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/ext4/move_extent.c b/fs/ext4/move_extent.c
index c8f895b410f6..5e2465a8e4ce 100644
--- a/fs/ext4/move_extent.c
+++ b/fs/ext4/move_extent.c
@@ -37,7 +37,7 @@ get_ext_path(struct inode *inode, ext4_lblk_t lblock,
int ret = 0;
struct ext4_ext_path *path;
- path = ext4_ext_find_extent(inode, lblock, *orig_path, EXT4_EX_NOCACHE);
+ path = ext4_ext_find_extent(inode, lblock, orig_path, EXT4_EX_NOCACHE);
if (IS_ERR(path))
ret = PTR_ERR(path);
else if (path[ext_depth(inode)].p_ext == NULL)