In the Linux kernel, the following vulnerability has been resolved:
btrfs: free pages on error in btrfs_uring_read_extent()
In this function the 'pages' object is never freed in the hopes that it is
picked up by btrfs_uring_read_finished() whenever that executes in the
future. But that's just the happy path. Along the way previous
allocations might have gone wrong, or we might not get -EIOCBQUEUED from
btrfs_encoded_read_regular_fill_pages().
In all these cases, we go to a
cleanup section that frees all memory allocated by this function without
assuming any deferred execution, and this also needs to happen for the
'pages' allocation.
References 3
https://git.kernel.org/stable/c/3f501412f2079ca14bf68a18d80a2b7a823f1f64
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/628895890b0c9ac9129129e89455da7db95ba343
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/d4f210de01eaccac61eee657f676045ef9771d07
416baaa9-dc9f-4396-8d5f-8c081fb06d67