From 251fc70e9722f931eec23a34030d05ba5f747b0e Mon Sep 17 00:00:00 2001 From: Denys Vlasenko Date: Thu, 18 Aug 2011 14:29:41 +0200 Subject: uncompress: fix buffer underrun by corrupted input Signed-off-by: Denys Vlasenko --- archival/libarchive/decompress_uncompress.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) (limited to 'archival') diff --git a/archival/libarchive/decompress_uncompress.c b/archival/libarchive/decompress_uncompress.c index 44d894244..329894be1 100644 --- a/archival/libarchive/decompress_uncompress.c +++ b/archival/libarchive/decompress_uncompress.c @@ -163,7 +163,8 @@ unpack_Z_stream(int fd_in, int fd_out) if (insize < (int) (IBUFSIZ + 64) - IBUFSIZ) { rsize = safe_read(fd_in, inbuf + insize, IBUFSIZ); -//error check?? + if (rsize < 0) + bb_error_msg(bb_msg_read_error); insize += rsize; } @@ -195,6 +196,8 @@ unpack_Z_stream(int fd_in, int fd_out) if (oldcode == -1) { + if (code >= 256) + bb_error_msg_and_die("corrupted data"); /* %ld", code); */ oldcode = code; finchar = (int) oldcode; outbuf[outpos++] = (unsigned char) finchar; @@ -239,6 +242,8 @@ unpack_Z_stream(int fd_in, int fd_out) /* Generate output characters in reverse order */ while ((long) code >= (long) 256) { + if (stackp <= &htabof(0)) + bb_error_msg_and_die("corrupted data"); *--stackp = tab_suffixof(code); code = tab_prefixof(code); } @@ -263,8 +268,7 @@ unpack_Z_stream(int fd_in, int fd_out) } if (outpos >= OBUFSIZ) { - full_write(fd_out, outbuf, outpos); -//error check?? + xwrite(fd_out, outbuf, outpos); IF_DESKTOP(total_written += outpos;) outpos = 0; } @@ -292,8 +296,7 @@ unpack_Z_stream(int fd_in, int fd_out) } while (rsize > 0); if (outpos > 0) { - full_write(fd_out, outbuf, outpos); -//error check?? + xwrite(fd_out, outbuf, outpos); IF_DESKTOP(total_written += outpos;) } -- cgit v1.2.3