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kwbimage: check return value of image_get_csk_index

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image_get_csk_index() may return -1 in case of an error. Don't use this
value as index.

This resolves Coverity CID 338488
Memory - illegal accesses  (NEGATIVE_RETURNS)

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Stefan Roese <sr@denx.de>
Reviewed-by: Pali Rohár <pali@kernel.org>
This commit is contained in:
Heinrich Schuchardt
2021-08-17 07:11:58 +02:00
committed by Stefan Roese
parent f858bb2e6c
commit f0317d7882
1 changed files with 1 additions and 1 deletions
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2
tools/kwbimage.c
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@@ -1087,7 +1087,7 @@ int kwb_sign_csk_with_kak(struct image_tool_params *params,
int csk_idx = image_get_csk_index();
struct sig_v1 tmp_sig;
if (csk_idx >= 16) {
if (csk_idx < 0 || csk_idx > 15) {
fprintf(stderr, "Invalid CSK index %d\n", csk_idx);
return 1;
}