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authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>2015-11-07 01:31:31 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2015-11-07 02:50:42 +0100
commit9f029f540c2f7e010e4922d44ba0dfd05da79f88 (patch)
tree78fea77298162d02e9d9d252cf746b2b685fdeb9 /lib
parentrbtree: clarify documentation of rbtree_postorder_for_each_entry_safe() (diff)
downloadlinux-9f029f540c2f7e010e4922d44ba0dfd05da79f88.tar.xz
linux-9f029f540c2f7e010e4922d44ba0dfd05da79f88.zip
lib/hexdump.c: truncate output in case of overflow
There is a classical off-by-one error in case when we try to place, for example, 1+1 bytes as hex in the buffer of size 6. The expected result is to get an output truncated, but in the reality we get 6 bytes filed followed by terminating NUL. Change the logic how we fill the output in case of byte dumping into limited space. This will follow the snprintf() behaviour by truncating output even on half bytes. Fixes: 114fc1afb2de (hexdump: make it return number of bytes placed in buffer) Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reported-by: Aaro Koskinen <aaro.koskinen@nokia.com> Tested-by: Aaro Koskinen <aaro.koskinen@nokia.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib')
-rw-r--r--lib/hexdump.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/lib/hexdump.c b/lib/hexdump.c
index 8d74c20d8595..992457b1284c 100644
--- a/lib/hexdump.c
+++ b/lib/hexdump.c
@@ -169,11 +169,15 @@ int hex_dump_to_buffer(const void *buf, size_t len, int rowsize, int groupsize,
}
} else {
for (j = 0; j < len; j++) {
- if (linebuflen < lx + 3)
+ if (linebuflen < lx + 2)
goto overflow2;
ch = ptr[j];
linebuf[lx++] = hex_asc_hi(ch);
+ if (linebuflen < lx + 2)
+ goto overflow2;
linebuf[lx++] = hex_asc_lo(ch);
+ if (linebuflen < lx + 2)
+ goto overflow2;
linebuf[lx++] = ' ';
}
if (j)