The output buffer size must not be reset by the gzip decoder or there
is a risk of overflowing memory during decompression.
Signed-off-by: Kees Cook <keesc...@chromium.org>
Acked-by: Simon Glass <s...@chromium.org>
---
lib/gunzip.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/lib/gunzip.c b/lib/gunzip.c
index 9959781..35abfb3 100644
--- a/lib/gunzip.c
+++ b/lib/gunzip.c
@@ -89,13 +89,13 @@ int zunzip(void *dst, int dstlen, unsigned char *src,
unsigned long *lenp,
s.avail_out = dstlen;
do {
r = inflate(&s, Z_FINISH);
- if (r != Z_STREAM_END && r != Z_BUF_ERROR && stoponerr == 1) {
+ if (stoponerr == 1 && r != Z_STREAM_END &&
+ (s.avail_out == 0 || r != Z_BUF_ERROR)) {
printf("Error: inflate() returned %d\n", r);
inflateEnd(&s);
return -1;
}
s.avail_in = *lenp - offset - (int)(s.next_out - (unsigned
char*)dst);
- s.avail_out = dstlen;
} while (r == Z_BUF_ERROR);
*lenp = s.next_out - (unsigned char *) dst;
inflateEnd(&s);
--
1.7.9.5
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