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s390/dasd: Use scnprintf() instead of sprintf()

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Use scnprintf() instead of sprintf() for those cases where the
destination is an array and the size of the array is known at compile
time.

This prevents theoretical buffer overflows, but also avoids that people
again and again spend time to figure out if the code is actually safe.

Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
Reviewed-by: Stefan Haberland <sth@linux.ibm.com>
Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jan Höppner 2025-11-26 17:06:34 +01:00 • committed by Jens Axboe
parent 43198756ee
commit a857d99201
1 changed files with 2 additions and 1 deletions
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3
drivers/s390/block/dasd_devmap.c
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@ -355,7 +355,8 @@ static int __init dasd_parse_range(const char *range)
/* each device in dasd= parameter should be set initially online */
features |= DASD_FEATURE_INITIAL_ONLINE;
while (from <= to) {
sprintf(bus_id, "%01x.%01x.%04x", from_id0, from_id1, from++);
scnprintf(bus_id, sizeof(bus_id),
"%01x.%01x.%04x", from_id0, from_id1, from++);
devmap = dasd_add_busid(bus_id, features);
if (IS_ERR(devmap)) {
rc = PTR_ERR(devmap);