* libbacktrace patch committed: don't skip aligned byte
@ 2022-04-05 23:09 Ian Lance Taylor
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From: Ian Lance Taylor @ 2022-04-05 23:09 UTC (permalink / raw)
To: gcc-patches; +Cc: rui314
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This libbacktrace patch by Rui Ueyama fixes handling an uncompressed
block that starts at an aligned byte. If the bits before the
uncompressed block ended at a byte boundary, libbacktrace accidentally
skipped the next byte, which is the first byte of the length of the
block. Bootstrapped and ran libbacktrace tests on
x86_64-pc-linux-gnu. Committed to mainline.
Ian
* elf.c (elf_zlib_inflate): Don't skip initial aligned byte in
uncompressed block.
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584ae0f0eea2a162dc02984c5976d5cbab5cd1e7
diff --git a/libbacktrace/elf.c b/libbacktrace/elf.c
index 5c7c21a8da7..8b82dd45875 100644
--- a/libbacktrace/elf.c
+++ b/libbacktrace/elf.c
@@ -1796,7 +1796,7 @@ elf_zlib_inflate (const unsigned char *pin, size_t sin, uint16_t *zdebug_table,
/* An uncompressed block. */
/* If we've read ahead more than a byte, back up. */
- while (bits > 8)
+ while (bits >= 8)
{
--pin;
bits -= 8;
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2022-04-05 23:09 libbacktrace patch committed: don't skip aligned byte Ian Lance Taylor
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