From e33761e6f23881de9f3ee77cc2204ab2e26f3d9a Mon Sep 17 00:00:00 2001 From: Michael Buesch Date: Mon, 23 Nov 2009 20:58:06 +0100 Subject: [PATCH] ssb: Fix range check in sprom write The range check in the sprom image parser hex2sprom() is broken. One sprom word is 4 hex characters. This fixes the check and also adds much better sanity checks to the code. We better make sure the image is OK by doing some sanity checks to avoid bricking the device by accident. Signed-off-by: Michael Buesch Cc: stable@kernel.org Signed-off-by: John W. Linville --- drivers/ssb/sprom.c | 20 ++++++++++++++++---- 1 file changed, 16 insertions(+), 4 deletions(-) diff --git a/drivers/ssb/sprom.c b/drivers/ssb/sprom.c index 580f779ecf49..d0e6762fec50 100644 --- a/drivers/ssb/sprom.c +++ b/drivers/ssb/sprom.c @@ -13,6 +13,8 @@ #include "ssb_private.h" +#include + static const struct ssb_sprom *fallback_sprom; @@ -33,17 +35,27 @@ static int sprom2hex(const u16 *sprom, char *buf, size_t buf_len, static int hex2sprom(u16 *sprom, const char *dump, size_t len, size_t sprom_size_words) { - char tmp[5] = { 0 }; - int cnt = 0; + char c, tmp[5] = { 0 }; + int err, cnt = 0; unsigned long parsed; - if (len < sprom_size_words * 2) + /* Strip whitespace at the end. */ + while (len) { + c = dump[len - 1]; + if (!isspace(c) && c != '\0') + break; + len--; + } + /* Length must match exactly. */ + if (len != sprom_size_words * 4) return -EINVAL; while (cnt < sprom_size_words) { memcpy(tmp, dump, 4); dump += 4; - parsed = simple_strtoul(tmp, NULL, 16); + err = strict_strtoul(tmp, 16, &parsed); + if (err) + return err; sprom[cnt++] = swab16((u16)parsed); }