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lib/zlib: DFLTCC not writing header bits when avail_out == 0 

This commit is based on:
  https://github.com/zlib-ng/zlib-ng/commit/ce409c6

Link: https://lkml.kernel.org/r/20230126131428.1222214-6-zaslonko@linux.ibm.com
Signed-off-by: Mikhail Zaslonko <zaslonko@linux.ibm.com>
Acked-by: Ilya Leoshkevich <iii@linux.ibm.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Mikhail Zaslonko 2023-01-26 14:14:25 +01:00 committed by Andrew Morton
parent 0dbae46550
commit cbf125408d
1 changed files with 9 additions and 4 deletions
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9
lib/zlib_dfltcc/dfltcc_deflate.c
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@ -170,12 +170,17 @@ again:
param->bcf = 0;
dfltcc_state->block_threshold =
strm->total_in + dfltcc_state->block_size;
}
}
/* No space for compressed data. If we proceed, dfltcc_cmpr() will return
* DFLTCC_CC_OP1_TOO_SHORT without buffering header bits, but we will still
* set BCF=1, which is wrong. Avoid complications and return early.
*/
if (strm->avail_out == 0) {
*result = need_more;
return 1;
}
}
}
/* The caller gave us too much data. Pass only one block worth of
* uncompressed data to DFLTCC and mask the rest, so that on the next