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s390/cmm: Replace sprintf() with scnprintf() for buffer safety

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Replace sprintf() with scnprintf() in cmm_timeout_handler() to prevent
potential buffer overflow. The scnprintf() function ensures we don't
write beyond the buffer size and provides safer string formatting.

Signed-off-by: Josephine Pfeiffer <hi@josie.lol>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Josephine Pfeiffer 2025-10-01 18:36:22 +02:00 committed by Heiko Carstens
parent 211ddde082
commit dd7d1d34ae
1 changed files with 2 additions and 2 deletions
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4
arch/s390/mm/cmm.c
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@ -321,8 +321,8 @@ static int cmm_timeout_handler(const struct ctl_table *ctl, int write,
cmm_set_timeout(nr, seconds);
*ppos += *lenp;
} else {
len = sprintf(buf, "%ld %ld\n",
cmm_timeout_pages, cmm_timeout_seconds);
len = scnprintf(buf, sizeof(buf), "%ld %ld\n",
cmm_timeout_pages, cmm_timeout_seconds);
if (len > *lenp)
len = *lenp;
memcpy(buffer, buf, len);