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From ec8ef90c1f573c9eb1f17d6a056aa0015f184acf Mon Sep 17 00:00:00 2001
From: Su_Laus <sulau@freenet.de>
Date: Tue, 14 Feb 2023 20:43:43 +0100
Subject: [PATCH] tiffcrop: Do not reuse input buffer for subsequent images.
Fix issue 527
Reuse of read_buff within loadImage() from previous image is quite unsafe, because other functions (like rotateImage() etc.) reallocate that buffer with different size without updating the local prev_readsize value.
Closes #527
CVE: CVE-2023-26965
Upstream-Status: Backport [https://gitlab.com/libtiff/libtiff/-/commit/ec8ef90c1f573c9eb1f17d6a056aa0015f184acf]
Signed-off-by: Natasha Bailey <nat.bailey@windriver.com>
---
tools/tiffcrop.c | 47 +++++++++++++----------------------------------
1 file changed, 13 insertions(+), 34 deletions(-)
diff --git a/tools/tiffcrop.c b/tools/tiffcrop.c
index d7ad5ca8..d3e11ba2 100644
--- a/tools/tiffcrop.c
+++ b/tools/tiffcrop.c
@@ -6771,9 +6771,7 @@ static int loadImage(TIFF *in, struct image_data *image, struct dump_opts *dump,
uint32_t tw = 0, tl = 0; /* Tile width and length */
tmsize_t tile_rowsize = 0;
unsigned char *read_buff = NULL;
- unsigned char *new_buff = NULL;
int readunit = 0;
- static tmsize_t prev_readsize = 0;
TIFFGetFieldDefaulted(in, TIFFTAG_BITSPERSAMPLE, &bps);
TIFFGetFieldDefaulted(in, TIFFTAG_SAMPLESPERPIXEL, &spp);
@@ -7097,43 +7095,25 @@ static int loadImage(TIFF *in, struct image_data *image, struct dump_opts *dump,
}
read_buff = *read_ptr;
- /* +3 : add a few guard bytes since reverseSamples16bits() can read a bit */
- /* outside buffer */
- if (!read_buff)
+ /* +3 : add a few guard bytes since reverseSamples16bits() can read a bit
+ * outside buffer */
+ /* Reuse of read_buff from previous image is quite unsafe, because other
+ * functions (like rotateImage() etc.) reallocate that buffer with different
+ * size without updating the local prev_readsize value. */
+ if (read_buff)
{
- if (buffsize > 0xFFFFFFFFU - 3)
- {
- TIFFError("loadImage", "Unable to allocate/reallocate read buffer");
- return (-1);
- }
- read_buff =
- (unsigned char *)limitMalloc(buffsize + NUM_BUFF_OVERSIZE_BYTES);
+ _TIFFfree(read_buff);
}
- else
+ if (buffsize > 0xFFFFFFFFU - 3)
{
- if (prev_readsize < buffsize)
- {
- if (buffsize > 0xFFFFFFFFU - 3)
- {
- TIFFError("loadImage",
- "Unable to allocate/reallocate read buffer");
- return (-1);
- }
- new_buff =
- _TIFFrealloc(read_buff, buffsize + NUM_BUFF_OVERSIZE_BYTES);
- if (!new_buff)
- {
- free(read_buff);
- read_buff = (unsigned char *)limitMalloc(
- buffsize + NUM_BUFF_OVERSIZE_BYTES);
- }
- else
- read_buff = new_buff;
- }
+ TIFFError("loadImage", "Required read buffer size too large");
+ return (-1);
}
+ read_buff =
+ (unsigned char *)limitMalloc(buffsize + NUM_BUFF_OVERSIZE_BYTES);
if (!read_buff)
{
- TIFFError("loadImage", "Unable to allocate/reallocate read buffer");
+ TIFFError("loadImage", "Unable to allocate read buffer");
return (-1);
}
@@ -7141,7 +7121,6 @@ static int loadImage(TIFF *in, struct image_data *image, struct dump_opts *dump,
read_buff[buffsize + 1] = 0;
read_buff[buffsize + 2] = 0;
- prev_readsize = buffsize;
*read_ptr = read_buff;
/* N.B. The read functions used copy separate plane data into a buffer as
--
2.39.0
|
