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ubifs: fix snprintf() checking

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The snprintf() function returns the number of characters (not
counting the NUL terminator) that it would have printed if we
had space.

This buffer has UBIFS_DFS_DIR_LEN characters plus one extra for
the terminator.  Printing UBIFS_DFS_DIR_LEN is okay but anything
higher will result in truncation.  Thus the comparison needs to be
change from == to >.

These strings are compile time constants so this patch doesn't
affect runtime.

Fixes: ae380ce047 ("UBIFS: lessen the size of debugging info data structure")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Alexander Dahl <ada@thorsis.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Dan Carpenter 2021-05-11 10:12:00 +03:00 • committed by Richard Weinberger
parent a2c2a622d4
commit be076fdf83
2 changed files with 2 additions and 2 deletions
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2
drivers/mtd/ubi/debug.c
View file

@ -511,7 +511,7 @@ int ubi_debugfs_init_dev(struct ubi_device *ubi)
n = snprintf(d->dfs_dir_name, UBI_DFS_DIR_LEN + 1, UBI_DFS_DIR_NAME,
ubi->ubi_num);
if (n == UBI_DFS_DIR_LEN) {
if (n > UBI_DFS_DIR_LEN) {
/* The array size is too small */
return -EINVAL;
}

2
fs/ubifs/debug.c
View file

@ -2824,7 +2824,7 @@ void dbg_debugfs_init_fs(struct ubifs_info *c)
n = snprintf(d->dfs_dir_name, UBIFS_DFS_DIR_LEN + 1, UBIFS_DFS_DIR_NAME,
c->vi.ubi_num, c->vi.vol_id);
if (n == UBIFS_DFS_DIR_LEN) {
if (n > UBIFS_DFS_DIR_LEN) {
/* The array size is too small */
return;
}