forked from pool/opensc
40 lines
1.5 KiB
Diff
40 lines
1.5 KiB
Diff
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From f1993dc4e0b33050b8f72a3558ee88b24c4063b2 Mon Sep 17 00:00:00 2001
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From: Peter Popovec <popovec.peter@gmail.com>
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Date: Tue, 27 Jun 2023 09:50:42 +0200
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Subject: [PATCH] myeid: fixed CID 380538 Out-of-bounds read (OVERRUN)
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also fixes output buffer size checking
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---
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src/libopensc/card-myeid.c | 10 ++++++----
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1 file changed, 6 insertions(+), 4 deletions(-)
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diff --git a/src/libopensc/card-myeid.c b/src/libopensc/card-myeid.c
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index 4ee4246840..50e78ff1d8 100644
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--- a/src/libopensc/card-myeid.c
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+++ b/src/libopensc/card-myeid.c
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@@ -1986,18 +1986,20 @@ myeid_enc_dec_sym(struct sc_card *card, const u8 *data, size_t datalen,
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sc_log(ctx, "Found padding byte %02x", pad_byte);
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if (pad_byte == 0 || pad_byte > block_size)
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LOG_FUNC_RETURN(ctx, SC_ERROR_WRONG_PADDING);
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- sdata = priv->sym_plain_buffer + block_size - pad_byte;
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+ sdata = priv->sym_plain_buffer + block_size;
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for (i = 0; i < pad_byte; i++)
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- if (sdata[i] != pad_byte)
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+ if (*(--sdata) != pad_byte)
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LOG_FUNC_RETURN(ctx, SC_ERROR_WRONG_PADDING);
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return_len = block_size - pad_byte;
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}
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- *outlen = return_len;
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/* application can request buffer size or actual buffer size is too small */
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- if (out == NULL)
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+ if (out == NULL) {
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+ *outlen = return_len;
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LOG_FUNC_RETURN(ctx, SC_SUCCESS);
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+ }
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if (return_len > *outlen)
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LOG_FUNC_RETURN(ctx, SC_ERROR_BUFFER_TOO_SMALL);
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+ *outlen = return_len;
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memcpy(out, priv->sym_plain_buffer, return_len);
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sc_log(ctx, "C_DecryptFinal %zu bytes", *outlen);
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return SC_SUCCESS;
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