From eb48efce260aefc0eceec90bd4d9adcd881f1b14 Mon Sep 17 00:00:00 2001 From: Heinrich Schuchardt Date: Tue, 22 Aug 2023 11:10:20 +0200 Subject: [PATCH] lib: parameter check in hash_calculate If hash_calculate is invoked with region_count = 0, it will try to hash INT_MAX regions. We should check this parameter. * Avoid a comparison with different signedness. * Check that region_count is at least 1. * Avoid a superfluous assignment. Fixes: b37b46f042cc ("rsa: Use checksum algorithms from struct hash_algo") Signed-off-by: Heinrich Schuchardt Reviewed-by: Simon Glass --- lib/hash-checksum.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/lib/hash-checksum.c b/lib/hash-checksum.c index 8f2a42f..68c290d 100644 --- a/lib/hash-checksum.c +++ b/lib/hash-checksum.c @@ -23,8 +23,10 @@ int hash_calculate(const char *name, struct hash_algo *algo; int ret = 0; void *ctx; - uint32_t i; - i = 0; + int i; + + if (region_count < 1) + return -EINVAL; ret = hash_progressive_lookup_algo(name, &algo); if (ret) -- 2.7.4