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misc: kgdbts: fix out-of-bounds access in function param_set_kgdbts_var

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There is an out-of-bounds access to "config[len - 1]" array when the
variable "len" is zero.

See commit dada6a43b0 ("kgdboc: fix KASAN global-out-of-bounds bug
in param_set_kgdboc_var()") for details.

Signed-off-by: Young Xiao <YangX92@hotmail.com>
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
This commit is contained in:
Young Xiao 2019-04-12 15:45:06 +08:00 committed by Daniel Thompson
parent 9b555c4d78
commit 976643af4e
1 changed files with 2 additions and 2 deletions
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4
drivers/misc/kgdbts.c
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@ -1135,7 +1135,7 @@ static void kgdbts_put_char(u8 chr)
static int param_set_kgdbts_var(const char *kmessage,
const struct kernel_param *kp)
{
int len = strlen(kmessage);
size_t len = strlen(kmessage);
if (len >= MAX_CONFIG_LEN) {
printk(KERN_ERR "kgdbts: config string too long\n");
@ -1155,7 +1155,7 @@ static int param_set_kgdbts_var(const char *kmessage,
strcpy(config, kmessage);
/* Chop out \n char as a result of echo */
if (config[len - 1] == '\n')
if (len && config[len - 1] == '\n')
config[len - 1] = '\0';
/* Go and configure with the new params. */