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| author | Dan Carpenter <[email protected]> | 2025-09-30 12:32:34 +0000 |
|---|---|---|
| committer | Miquel Raynal <[email protected]> | 2025-10-22 09:53:59 +0000 |
| commit | e4185bed738da755b191aa3f2e16e8b48450e1b8 (patch) | |
| tree | e7ed39f0dea06784cd6cf9eaccdfb1f642feae73 /lib/mpi/mpi-mod.c | |
| parent | Linux 6.18-rc1 (diff) | |
| download | kernel-e4185bed738da755b191aa3f2e16e8b48450e1b8.tar.gz kernel-e4185bed738da755b191aa3f2e16e8b48450e1b8.zip | |
mtdchar: fix integer overflow in read/write ioctls
The "req.start" and "req.len" variables are u64 values that come from the
user at the start of the function. We mask away the high 32 bits of
"req.len" so that's capped at U32_MAX but the "req.start" variable can go
up to U64_MAX which means that the addition can still integer overflow.
Use check_add_overflow() to fix this bug.
Fixes: 095bb6e44eb1 ("mtdchar: add MEMREAD ioctl")
Fixes: 6420ac0af95d ("mtdchar: prevent unbounded allocation in MEMWRITE ioctl")
Cc: [email protected]
Signed-off-by: Dan Carpenter <[email protected]>
Signed-off-by: Miquel Raynal <[email protected]>
Diffstat (limited to 'lib/mpi/mpi-mod.c')
0 files changed, 0 insertions, 0 deletions