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autoboot: fix illegal memory access when stop key and delay key are empty

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If both stop key and delay key are empty, the length of these
keys is 0. The subtraction operation will cause the u_int type
variable to overflow, will cause illegal memory access in key
input loop.

This commit fixes this bug by using int type instead of u_init.
Acked-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Yuezhang.Mo@sony.com 2021-01-15 03:11:49 +00:00 committed by Tom Rini
parent 1e35a4d228
commit e088f0c3d8
1 changed files with 3 additions and 3 deletions
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6
common/autoboot.c
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@ -164,9 +164,9 @@ static int passwd_abort_key(uint64_t etime)
}; };
char presskey[MAX_DELAY_STOP_STR]; char presskey[MAX_DELAY_STOP_STR];
u_int presskey_len = 0; int presskey_len = 0;
u_int presskey_max = 0; int presskey_max = 0;
u_int i; int i;
# ifdef CONFIG_AUTOBOOT_DELAY_STR # ifdef CONFIG_AUTOBOOT_DELAY_STR
if (delaykey[0].str == NULL) if (delaykey[0].str == NULL)