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mmc: sdio: Check for CISTPL_VERS_1 buffer size

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[ Upstream commit 8ebe2607965d3e2dc02029e8c7dd35fbe508ffd0 ]

Before parsing CISTPL_VERS_1 structure check that its size is at least two
bytes to prevent buffer overflow.

Signed-off-by: Pali Rohár <pali@kernel.org>
Link: https://lore.kernel.org/r/20200727133837.19086-2-pali@kernel.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Pali Rohár 2020-07-27 15:38:34 +02:00 committed by Greg Kroah-Hartman
parent 3b899e9244
commit 669c958268
1 changed files with 3 additions and 0 deletions
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3
drivers/mmc/core/sdio_cis.c
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@ -30,6 +30,9 @@ static int cistpl_vers_1(struct mmc_card *card, struct sdio_func *func,
unsigned i, nr_strings;
char **buffer, *string;
if (size < 2)
return 0;
/* Find all null-terminated (including zero length) strings in
the TPLLV1_INFO field. Trailing garbage is ignored. */
buf += 2;