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Avoid freeing buffer offset

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Related: RHEL-16450
This commit is contained in:
Jakub Jelen 2023-11-30 17:43:49 +01:00
parent 9df0534fc4
commit 5c60a0f409
1 changed files with 35 additions and 0 deletions
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35
opensc-0.23.0-constant-time-pkcs1.5.patch
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@ -438,3 +438,38 @@ index 66dfcdde67..7239b4c5b8 100644
/* Debug virtual slots. S is slot to be highlighted or NULL
* C is a comment format string and args It will be preceded by "VSS " */
#define DEBUG_VSS(S, ...) do { sc_log(context,"VSS " __VA_ARGS__); _debug_virtual_slots(S); } while (0)
diff --git a/src/libopensc/padding.c b/src/libopensc/padding.c
index ceb2a1e21..c2cc58d47 100644
--- a/src/libopensc/padding.c
+++ b/src/libopensc/padding.c
@@ -192,7 +192,7 @@ int
sc_pkcs1_strip_02_padding_constant_time(sc_context_t *ctx, unsigned int n, const u8 *data, unsigned int data_len, u8 *out, unsigned int *out_len)
{
unsigned int i = 0;
- u8 *msg = NULL;
+ u8 *msg, *msg_orig = NULL;
unsigned int good, found_zero_byte, mask;
unsigned int zero_index = 0, msg_index, mlen = -1, len = 0;
LOG_FUNC_CALLED(ctx);
@@ -200,7 +200,7 @@ sc_pkcs1_strip_02_padding_constant_time(sc_context_t *ctx, unsigned int n, const
if (data == NULL || data_len <= 0 || data_len > n || n < SC_PKCS1_PADDING_MIN_SIZE)
LOG_FUNC_RETURN(ctx, SC_ERROR_INTERNAL);
- msg = calloc(n, sizeof(u8));
+ msg = msg_orig = calloc(n, sizeof(u8));
if (msg == NULL)
LOG_FUNC_RETURN(ctx, SC_ERROR_INTERNAL);
@@ -261,7 +261,7 @@ sc_pkcs1_strip_02_padding_constant_time(sc_context_t *ctx, unsigned int n, const
out[i] = constant_time_select_8(mask, msg[msg_index], out[i]);
}
- free(msg);
+ free(msg_orig);
return constant_time_select(good, mlen, SC_ERROR_WRONG_PADDING);
}
--
2.43.0