If an unknown flag is present in a FIEMAP extent, it is printed as a hex value into a temporary buffer before adding it to the flags. If that unknown flag is over 0xfff then it will overflow the temporary buffer. Reported-by: Sarah Liu <wei3.liu@xxxxxxxxx> Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-10335 Signed-off-by: Andreas Dilger <andreas.dilger@xxxxxxxxx> --- misc/filefrag.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/misc/filefrag.c b/misc/filefrag.c index 9c57ab9..dc00393 100644 --- a/misc/filefrag.c +++ b/misc/filefrag.c @@ -179,7 +179,7 @@ static void print_extent_info(struct fiemap_extent *fm_extent, int cur_ex, print_flag(&fe_flags, FIEMAP_EXTENT_SHARED, flags, "shared,"); /* print any unknown flags as hex values */ for (mask = 1; fe_flags != 0 && mask != 0; mask <<= 1) { - char hex[6]; + char hex[sizeof(mask) * 2 + 4]; /* 2 chars/byte + 0x, + NUL */ if ((fe_flags & mask) == 0) continue; -- 1.8.0
