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authorHeiko Carstens <heiko.carstens@de.ibm.com>2013-05-06 16:26:01 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2013-05-07 14:11:55 +0200
commit7678dcfb310a190aea9bee8cdeb1e14987600737 (patch)
tree9039d04a93259d37e821d6249dbeaa0bddf03cfc /arch/s390/kernel/dis.c
parent9673217c71b433d62d56cfb56c487e31af6f5574 (diff)
downloadlinux-7678dcfb310a190aea9bee8cdeb1e14987600737.tar.bz2
s390/disassembler: prevent endless loop in print_fn_code()
If the size of the opcode to be printed is larger than "len" we'll see an overflow of an unsigned long value, which means that the while loop within print_fn_code() will loop quite a long time until there is the next chance for an exit. So add an early exit check. Reported-by: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/dis.c')
-rw-r--r--arch/s390/kernel/dis.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/s390/kernel/dis.c b/arch/s390/kernel/dis.c
index 7f4a4a8c847c..be87d3e05a5b 100644
--- a/arch/s390/kernel/dis.c
+++ b/arch/s390/kernel/dis.c
@@ -1862,6 +1862,8 @@ void print_fn_code(unsigned char *code, unsigned long len)
while (len) {
ptr = buffer;
opsize = insn_length(*code);
+ if (opsize > len)
+ break;
ptr += sprintf(ptr, "%p: ", code);
for (i = 0; i < opsize; i++)
ptr += sprintf(ptr, "%02x", code[i]);