From: Denis Arefev arefev@swemel.ru
commit 97bbf9e312c3fbaf0baa56120238825d2eb23b8a upstream.
Added a check for ubi_num for negative numbers If the variable ubi_num takes negative values then we get:
qemu-system-arm ... -append "ubi.mtd=0,0,0,-22222345" ... [ 0.745065] ubi_attach_mtd_dev from ubi_init+0x178/0x218 [ 0.745230] ubi_init from do_one_initcall+0x70/0x1ac [ 0.745344] do_one_initcall from kernel_init_freeable+0x198/0x224 [ 0.745474] kernel_init_freeable from kernel_init+0x18/0x134 [ 0.745600] kernel_init from ret_from_fork+0x14/0x28 [ 0.745727] Exception stack(0x90015fb0 to 0x90015ff8)
Found by Linux Verification Center (linuxtesting.org) with SVACE.
Fixes: 83ff59a06663 ("UBI: support ubi_num on mtd.ubi command line") Signed-off-by: Denis Arefev arefev@swemel.ru Reviewed-by: Zhihao Cheng chengzhihao1@huawei.com Signed-off-by: Richard Weinberger richard@nod.at [Denis: minor fix to resolve merge conflict.] Signed-off-by: Denis Arefev arefev@swemel.ru --- drivers/mtd/ubi/build.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c index 6fbd77dc1d18..6a7577e57617 100644 --- a/drivers/mtd/ubi/build.c +++ b/drivers/mtd/ubi/build.c @@ -1460,9 +1460,9 @@ static int ubi_mtd_param_parse(const char *val, const struct kernel_param *kp) if (token) { int err = kstrtoint(token, 10, &p->ubi_num);
- if (err) { - pr_err("UBI error: bad value for ubi_num parameter: %s", - token); + if (err || p->ubi_num < UBI_DEV_NUM_AUTO) { + pr_err("UBI error: bad value for ubi_num parameter: %s\n", + token); return -EINVAL; } } else