mirrors/u-boot
0
0
Fork 0
mirror of https://github.com/u-boot/u-boot.git synced 2024-11-29 15:43:44 +08:00
Code Issues Packages Projects Releases Wiki Activity

zlib: handle overflow while calculating available stream input size

Browse Source 
If compressed data is located in sectors at the end of the flash and
it's offset + input stream size > 0xFFFFFFFF, the uncompressing time
is very long, since processing of the stream is done bytewise (and
not blockwise) due to overflow in inflate_fast() while calculation
and checking for enough input available.

Check for this overflow condition and limit the available stream
input size to the actually max. possible input size. This fixes
the problem.

The issue is easily reproduceable by placing a gziped bitmap in flash,
e.g. at FFF80000, and running 'bmp' commands like 'bmp info FFF80000'
or 'bmp display FFF80000'. The uncompressing can take up to 3 sec.
whereas it should normaly take a fraction of a second. If the
'splashimage' environment variable points to this address, the
booting time also increases significantly.

Signed-off-by: Anatolij Gustschin <agust@denx.de>
This commit is contained in:
Anatolij Gustschin 2011-10-15 06:32:52 +00:00 committed by Wolfgang Denk
parent 8d80d05753
commit 92faa8b109
1 changed files with 8 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
lib/zlib/inffast.c
View File

@ -100,6 +100,14 @@ unsigned start; /* inflate()'s starting value for strm->avail_out */
state = (struct inflate_state FAR *)strm->state;
in = strm->next_in - OFF;
last = in + (strm->avail_in - 5);
if (in > last && strm->avail_in > 5) {
/*
* overflow detected, limit strm->avail_in to the
* max. possible size and recalculate last
*/
strm->avail_in = 0xffffffff - (unsigned int)in;
last = in + (strm->avail_in - 5);
}
out = strm->next_out - OFF;
beg = out - (start - strm->avail_out);
end = out + (strm->avail_out - 257);