The patch titled
Subject: lib/hexdump.c: truncate output in case of overflow
has been added to the -mm tree. Its filename is
hexdump-truncate-output-in-case-of-overflow.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/hexdump-truncate-output-in-case-of-overflow.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/hexdump-truncate-output-in-case-of-overflow.patch
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------------------------------------------------------
From: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Subject: 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@xxxxxxxxxxxxxxx>
Reported-by: Aaro Koskinen <aaro.koskinen@xxxxxxxxx>
Tested-by: Aaro Koskinen <aaro.koskinen@xxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/hexdump.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff -puN lib/hexdump.c~hexdump-truncate-output-in-case-of-overflow lib/hexdump.c
--- a/lib/hexdump.c~hexdump-truncate-output-in-case-of-overflow
+++ a/lib/hexdump.c
@@ -169,11 +169,15 @@ int hex_dump_to_buffer(const void *buf,
}
} 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)
_
Patches currently in -mm which might be from andriy.shevchenko@xxxxxxxxxxxxxxx are
fs-proc-arrayc-set-overflow-flag-in-case-of-error.patch
hexdump-truncate-output-in-case-of-overflow.patch
fs-seq_file-use-seq_-helpers-in-seq_hex_dump.patch
seq_file-re-use-string_escape_str.patch
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