mmc: sdio: Check for CISTPL_VERS_1 buffer size
[ Upstream commit 8ebe260796
]
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>
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@ -26,6 +26,9 @@ static int cistpl_vers_1(struct mmc_card *card, struct sdio_func *func,
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unsigned i, nr_strings;
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char **buffer, *string;
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if (size < 2)
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return 0;
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/* Find all null-terminated (including zero length) strings in
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the TPLLV1_INFO field. Trailing garbage is ignored. */
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buf += 2;
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