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The following commit(s) were added to refs/heads/master by this push:
new 7ae36ceba9 avcodec/alsdec: do not set nbits invalidly
7ae36ceba9 is described below
commit 7ae36ceba9ef5a9c6409a2b196893f9f1d0c6d4e
Author: Michael Niedermayer <[email protected]>
AuthorDate: Wed Mar 25 01:25:40 2026 +0100
Commit: michaelni <[email protected]>
CommitDate: Sun May 3 14:54:27 2026 +0000
avcodec/alsdec: do not set nbits invalidly
note that the spec actually disallows the 0 case too but we are
a little lenient here so the full 24bit twos-complement range can be handled
Signed-off-by: Michael Niedermayer <[email protected]>
---
libavcodec/alsdec.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/libavcodec/alsdec.c b/libavcodec/alsdec.c
index bf1b453dbb..5378d01d43 100644
--- a/libavcodec/alsdec.c
+++ b/libavcodec/alsdec.c
@@ -1564,7 +1564,10 @@ static int read_diff_float_data(ALSDecContext *ctx,
unsigned int ra_frame) {
if (ctx->raw_samples[c][i] != 0) {
//The following logic is taken from Table 14.45 and 14.46
from the ISO spec
if (av_cmp_sf_ieee754(acf[c], FLOAT_1)) {
- nbits[i] = 23 -
av_log2(FFABSU(ctx->raw_samples[c][i]));
+ int nbit = av_log2(FFABSU(ctx->raw_samples[c][i]));
+ if (nbit > 23)
+ return AVERROR_INVALIDDATA;
+ nbits[i] = 23 - nbit;
} else {
nbits[i] = 23;
}
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