In the Linux kernel, the following vulnerability has been resolved:

watch_queue: Free the page array when watch_queue is dismantled

Commit 7ea1a0124b6d ("watch_queue: Free the alloc bitmap when the
watch_queue is torn down") took care of the bitmap, but not the page
array.

BUG: memory leak
unreferenced object 0xffff88810d9bc140 (size 32):
comm "syz-executor335", pid 3603, jiffies 4294946994 (age 12.840s)
hex dump (first 32 bytes):
40 a7 40 04 00 ea ff ff 00 00 00 00 00 00 00 00 @.@.............
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
kmalloc_array include/linux/slab.h:621 [inline]
kcalloc include/linux/slab.h:652 [inline]
watch_queue_set_size+0x12f/0x2e0 kernel/watch_queue.c:251
pipe_ioctl+0x82/0x140 fs/pipe.c:632
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl fs/ioctl.c:860 [inline]
__x64_sys_ioctl+0xfc/0x140 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]

References

• https://nvd.nist.gov/vuln/detail/CVE-2022-49148
• https://git.kernel.org/stable/c/375cd2536494cfbcdda84ae8b3e35bf19d0250b9
• https://git.kernel.org/stable/c/3963a5d1ff75585bddf0c3a918566a6be09d7520
• https://git.kernel.org/stable/c/4913daecd04addb41bc96a9175a885e1c19862a8
• https://git.kernel.org/stable/c/7169f60110915c8b53bffd43741fa020a75eb87a
• https://git.kernel.org/stable/c/b490207017ba237d97b735b2aa66dc241ccd18f5