diff options
| author | giraffedata <giraffedata@9d0c8265-081b-0410-96cb-a4ca84ce46f8> | 2023-09-23 00:34:00 +0000 |
|---|---|---|
| committer | giraffedata <giraffedata@9d0c8265-081b-0410-96cb-a4ca84ce46f8> | 2023-09-23 00:34:00 +0000 |
| commit | 9a675079290758a7f68e497146cc3688f1c3d364 (patch) | |
| tree | 30e5a0f51a60a65b9ca31a994767c201fcaeb923 | |
| parent | c014bbdd71993b0a8c401091953016e776228673 (diff) | |
| download | netpbm-mirror-9a675079290758a7f68e497146cc3688f1c3d364.tar.gz netpbm-mirror-9a675079290758a7f68e497146cc3688f1c3d364.tar.xz netpbm-mirror-9a675079290758a7f68e497146cc3688f1c3d364.zip | |
Fix arithmetic overflow when bits per sample is > 16
git-svn-id: http://svn.code.sf.net/p/netpbm/code/trunk@4679 9d0c8265-081b-0410-96cb-a4ca84ce46f8
| -rw-r--r-- | lib/libpm.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/lib/libpm.c b/lib/libpm.c index 78d941fa..b27b47d5 100644 --- a/lib/libpm.c +++ b/lib/libpm.c @@ -442,12 +442,20 @@ pm_maxvaltobits(int const maxval) { assert(false); } + + int -pm_bitstomaxval(int const bits) { - return ( 1 << bits ) - 1; +pm_bitstomaxval(int const bitCt) { + + if (bitCt > 16) + pm_error("Bits per sample %u too large. 16 is maximum acceptable", + bitCt); + + return (1 << bitCt) - 1; } + unsigned int PURE_FN_ATTR pm_lcm(unsigned int const x, unsigned int const y, |