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Make fallback MD5 implementation thread-safe on big-endian systems 

Replace a static scratch buffer with a local variable, because a
static buffer makes the function not thread-safe. This function is
used in client-code in libpq, so it needs to be thread-safe. It was
until commit b67b57a966, which replaced the implementation with the
one from pgcrypto.

Backpatch to v14, where we switched to the new implementation.

Reviewed-by: Robert Haas, Michael Paquier
Discussion: https://www.postgresql.org/message-id/dfa2015d-ad21-4802-a4cc-3850fc5fff3f@iki.fi
This commit is contained in:
Heikki Linnakangas 2024-08-07 10:43:52 +03:00
parent 5388216f6a
commit 2676040df0
1 changed files with 1 additions and 4 deletions
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5
src/common/md5.c
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@ -150,10 +150,6 @@ static const uint8 md5_paddat[MD5_BUFLEN] = {
0, 0, 0, 0, 0, 0, 0, 0,
};
#ifdef WORDS_BIGENDIAN
static uint32 X[16];
#endif
static void
md5_calc(const uint8 *b64, pg_md5_ctx *ctx)
{
@ -167,6 +163,7 @@ md5_calc(const uint8 *b64, pg_md5_ctx *ctx)
#else
/* 4 byte words */
/* what a brute force but fast! */
uint32 X[16];
uint8 *y = (uint8 *) X;
y[0] = b64[3];