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| author | Milan Broz | 2018-11-07 22:24:55 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2019-01-26 09:32:42 +0100 |
| commit | 887b1c9a7d17c919bc1b8204da2631be419e9a31 (patch) | |
| tree | 367babbfdcf0b62278db1b00552bd5545c3a1cf4 /drivers/md/dm-delay.c | |
| parent | clocksource/drivers/integrator-ap: Add missing of_node_put() (diff) | |
| download | kernel-qcow2-linux-887b1c9a7d17c919bc1b8204da2631be419e9a31.tar.gz kernel-qcow2-linux-887b1c9a7d17c919bc1b8204da2631be419e9a31.tar.xz kernel-qcow2-linux-887b1c9a7d17c919bc1b8204da2631be419e9a31.zip | |
dm: Check for device sector overflow if CONFIG_LBDAF is not set
[ Upstream commit ef87bfc24f9b8da82c89aff493df20f078bc9cb1 ]
Reference to a device in device-mapper table contains offset in sectors.
If the sector_t is 32bit integer (CONFIG_LBDAF is not set), then
several device-mapper targets can overflow this offset and validity
check is then performed on a wrong offset and a wrong table is activated.
See for example (on 32bit without CONFIG_LBDAF) this overflow:
# dmsetup create test --table "0 2048 linear /dev/sdg 4294967297"
# dmsetup table test
0 2048 linear 8:96 1
This patch adds explicit check for overflow if the offset is sector_t type.
Signed-off-by: Milan Broz <gmazyland@gmail.com>
Reviewed-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/md/dm-delay.c')
| -rw-r--r-- | drivers/md/dm-delay.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/md/dm-delay.c b/drivers/md/dm-delay.c index 2fb7bb4304ad..fddffe251bf6 100644 --- a/drivers/md/dm-delay.c +++ b/drivers/md/dm-delay.c @@ -141,7 +141,7 @@ static int delay_class_ctr(struct dm_target *ti, struct delay_class *c, char **a unsigned long long tmpll; char dummy; - if (sscanf(argv[1], "%llu%c", &tmpll, &dummy) != 1) { + if (sscanf(argv[1], "%llu%c", &tmpll, &dummy) != 1 || tmpll != (sector_t)tmpll) { ti->error = "Invalid device sector"; return -EINVAL; } |