diff options
Diffstat (limited to 'src/liblzma/common/common.c')
| -rw-r--r-- | src/liblzma/common/common.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/src/liblzma/common/common.c b/src/liblzma/common/common.c index 1399b928..18453ae0 100644 --- a/src/liblzma/common/common.c +++ b/src/liblzma/common/common.c @@ -99,7 +99,11 @@ lzma_bufcpy(const uint8_t *restrict in, size_t *restrict in_pos, const size_t out_avail = out_size - *out_pos; const size_t copy_size = my_min(in_avail, out_avail); - memcpy(out + *out_pos, in + *in_pos, copy_size); + // Call memcpy() only if there is something to copy. If there is + // nothing to copy, in or out might be NULL and then the memcpy() + // call would trigger undefined behavior. + if (copy_size > 0) + memcpy(out + *out_pos, in + *in_pos, copy_size); *in_pos += copy_size; *out_pos += copy_size; |