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authorRohit kumar <rohitkr@codeaurora.org>2018-09-11 14:59:21 +0530
committerMark Brown <broonie@kernel.org>2018-09-11 11:58:52 +0100
commitae7d1247d8673ebfd686b17e759d4be391165368 (patch)
tree2ccae8d334321c51b28558d0528089b8051796ac /sound/soc/soc-ops.c
parent54a3da1c105ca91c4d32f25c3d9c57a61e9a3467 (diff)
ASoC: Fix UBSAN warning at snd_soc_get/put_volsw_sx()
In functions snd_soc_get_volsw_sx() or snd_soc_put_volsw_sx(), if the result of (min + max) is negative, then fls() returns signed integer with value as 32. This leads to signed integer overflow as complete operation is considered as signed integer. UBSAN: Undefined behaviour in sound/soc/soc-ops.c:382:50 signed integer overflow: -2147483648 - 1 cannot be represented in type 'int' Call trace: [<ffffff852f746fe4>] __dump_stack lib/dump_stack.c:15 [inline] [<ffffff852f746fe4>] dump_stack+0xec/0x158 lib/dump_stack.c:51 [<ffffff852f7b5f3c>] ubsan_epilogue+0x18/0x50 lib/ubsan.c:164 [<ffffff852f7b6840>] handle_overflow+0xf8/0x130 lib/ubsan.c:195 [<ffffff852f7b68f0>] __ubsan_handle_sub_overflow+0x34/0x44 lib/ubsan.c:211 [<ffffff85307971a0>] snd_soc_get_volsw_sx+0x1a8/0x1f8 sound/soc/soc-ops.c:382 Typecast the operation to unsigned int to fix the issue. Signed-off-by: Rohit kumar <rohitkr@codeaurora.org> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound/soc/soc-ops.c')
-rw-r--r--sound/soc/soc-ops.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/sound/soc/soc-ops.c b/sound/soc/soc-ops.c
index 592efb370c44..f4dc3d445aae 100644
--- a/sound/soc/soc-ops.c
+++ b/sound/soc/soc-ops.c
@@ -373,7 +373,7 @@ int snd_soc_get_volsw_sx(struct snd_kcontrol *kcontrol,
unsigned int rshift = mc->rshift;
int max = mc->max;
int min = mc->min;
- unsigned int mask = (1 << (fls(min + max) - 1)) - 1;
+ unsigned int mask = (1U << (fls(min + max) - 1)) - 1;
unsigned int val;
int ret;
@@ -418,7 +418,7 @@ int snd_soc_put_volsw_sx(struct snd_kcontrol *kcontrol,
unsigned int rshift = mc->rshift;
int max = mc->max;
int min = mc->min;
- unsigned int mask = (1 << (fls(min + max) - 1)) - 1;
+ unsigned int mask = (1U << (fls(min + max) - 1)) - 1;
int err = 0;
unsigned int val, val_mask, val2 = 0;