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avcodec/fitsdec: fix use of uninitialised values

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header.data_max and header.data_min are not necessarely set on all decoding scenarios.

Fixes a Valgrind reported regression since cfa1937791.

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer 2019-09-28 23:11:06 -03:00
parent 9fdc2c7bc4
commit e3f0ecfc57
1 changed files with 7 additions and 7 deletions
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14
libavcodec/fitsdec.c
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@ -195,7 +195,6 @@ static int fits_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
uint8_t *dst8;
uint16_t *dst16;
uint64_t t;
double scale;
FITSHeader header;
FITSContext * fitsctx = avctx->priv_data;
@ -205,12 +204,6 @@ static int fits_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
if (ret < 0)
return ret;
scale = header.data_max - header.data_min;
if (scale <= 0 || !isfinite(scale)) {
scale = 1;
}
scale = 1/scale;
if (header.rgb) {
if (header.bitpix == 8) {
if (header.naxisn[2] == 3) {
@ -271,6 +264,13 @@ static int fits_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
CASE_RGB(16, dst16, uint16_t, AV_RB16);
}
} else {
double scale = header.data_max - header.data_min;
if (scale <= 0 || !isfinite(scale)) {
scale = 1;
}
scale = 1/scale;
switch (header.bitpix) {
#define CASE_GRAY(cas, dst, type, t, rd) \
case cas: \