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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2022-12-05 11:33:40 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2022-12-05 11:33:40 -0800 |
| commit | e6cfaf34be9fcd1a8285a294e18986bfc41a409c (patch) | |
| tree | 99980bc2f566db463d0080a56af31d6b76e230bd /kernel/sysctl.c | |
| parent | b52be557e24c47286738276121177a41f54e3b83 (diff) | |
| download | linux-e6cfaf34be9fcd1a8285a294e18986bfc41a409c.tar.gz linux-e6cfaf34be9fcd1a8285a294e18986bfc41a409c.tar.bz2 linux-e6cfaf34be9fcd1a8285a294e18986bfc41a409c.zip | |
proc: avoid integer type confusion in get_proc_long
proc_get_long() is passed a size_t, but then assigns it to an 'int'
variable for the length. Let's not do that, even if our IO paths are
limited to MAX_RW_COUNT (exactly because of these kinds of type errors).
So do the proper test in the rigth type.
Reported-by: Kyle Zeng <zengyhkyle@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/sysctl.c')
| -rw-r--r-- | kernel/sysctl.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 188c305aeb8b..8898ddeaaf75 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -342,13 +342,12 @@ static int proc_get_long(char **buf, size_t *size, unsigned long *val, bool *neg, const char *perm_tr, unsigned perm_tr_len, char *tr) { - int len; char *p, tmp[TMPBUFLEN]; + ssize_t len = *size; - if (!*size) + if (len <= 0) return -EINVAL; - len = *size; if (len > TMPBUFLEN - 1) len = TMPBUFLEN - 1; |