From: Nikanth Karthikesan <knikanth@xxxxxxx>
commit 6d19c42b7cf81c39632b6d4dbc514e8449bcd346 upstream (as of v2.6.34-git13)
Currently using posix_fallocate one can bypass an RLIMIT_FSIZE limit
and create a file larger than the limit. Add a check for that.
Signed-off-by: Nikanth Karthikesan <knikanth@xxxxxxx>
Signed-off-by: Amit Arora <aarora@xxxxxxxxxx>
Signed-off-by: "Theodore Ts'o" <tytso@xxxxxxx>
---
fs/ext4/extents.c | 5 +++++
1 files changed, 5 insertions(+), 0 deletions(-)
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 39aab5c..2ff79e8 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -3601,6 +3601,11 @@ long ext4_fallocate(struct inode *inode, int mode, loff_t offset, loff_t len)
*/
credits = ext4_chunk_trans_blocks(inode, max_blocks);
mutex_lock(&inode->i_mutex);
+ ret = inode_newsize_ok(inode, (len + offset));
+ if (ret) {
+ mutex_unlock(&inode->i_mutex);
+ return ret;
+ }
retry:
while (ret >= 0 && ret < max_blocks) {
block = block + ret;
--
1.6.6.1.1.g974db.dirty
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